Adjustable seat.



PATENTED FEB. 17:, 1903. A. ADLER. 1

ADJUSTABLE SEAT.

APPLICATION FILED "SEPT. 4, 1002,

no MODEL.

Zfz'fn e83 es I In van for:

UNITED STATES PATENT OFFICE.

ADALBERT ADLER, OF CONSTANOE, GERMANY.

ADJ USTABLE SEAT.

SPECIFICATION forming part of Letters Patent NO. 720,549, dated February 17, 1903.

Application filed September 4, 1902. Serial No. 122,062. (No model.)

To aZZ whom it may concern.-

Be it known that I, ADALBERT ADLER, a subject of the German Emperor, residing at Oonstance-on-the-Bodensee, in the Grand Duchy of Baden, Germany, have invented certain new and useful Improvements in Adjustable Seats; and I do hereby declare the following to be a full, clear, andexact de ments in chairs, stools, and the like adjustable as to height, the object of the improvement being to render the chair also rotatable.

In the annexed drawing, which is an elevation, partly in section,the invention is illustrated as applied to a music or piano stool.

In a tube a, forminga central upright from the tripod, another tube b is guided and serves as a support for the seat a. The latter can be adjusted at any desired height by telescoping one tube into the other,when the seat is fixed by jamming the ballse between the coupling-cone d, connected to the foot of the seat-support b,and the inner wall of the guidetube a, and thus coupling the two tubes as by a friction-clutch. The balls e rest on a plate adapted to be moved by means of a hand-lever h and rod g. A springt bears continuously on the'lever h, so that in the normal position the rod g is pulled upward, and the plate f is therefore also raised. The balls 6 are consequently jammed in between 01 and a and fix the seat both at its adjusted height and against rotation.

When the height of the seat is to be altered, the lever h is pushed or pulled by hand in the direction opposed to the spring-pressure, the rod g slides downward withthe plate f, and the balls are released, so that the tubes CL and Z) are uncoupled from each other, and

then by manually lifting or lowering the seat the desired adjustment is attained, the lever released, and the tubes once more coupled by the action of the spring.

So far the construction of the chair is known,

and that which hasv been described forms no part of the invention.

The improvement consists in thisthat in When by means of the plate g the chair is adjusted at the desired height, the seat 0 can still be rotated, since the support I), with its sleeve 70, moves on the extension Z of the cone d, which is rigidly held by the balls.

What I clainnand desire to secure by Letters Patent, is

The combination, to form an adjustable and rotatable seat, of the seat-support?) having a conical box at its lower end the tubular upright a in which said support telescopes, the coupling-cone d loosely'connected to the foot of the support and having the conical upper extension Z journaled in the aforesaid box, the balls, and means for jamming said balls between the coupling-cone and the tubular upright.

In testimony whereof I aflix my signature in presence of two witnesses.

ADALBERT ADLER.- Witnesses:

CLARA I. PARKER, HENRY R. MoGINNIs. 

